I believe that knowledge is power, and knowing they exist will help you recognize them for what they really are—just phases. They will pass! You will float in and out of them. Here are the four stages plus a fifth that is experienced by far fewer.
You may find yourself moving in and out of these stages many times. This is normal. Start expecting to fluctuate between moments of motivation and resolve, and moments of frustration and times where you'll consider giving up your new lifestyle. Crossing these hurdles means you'll be on course to Healthy Obsession, the winner's circle. You'll know you're there when you've conquered the goal of loving your new lifestyle—when you think the way healthy active people do.
The primary reason so many people go through some or all of these stages is because, when it comes to losing weight, the body isn't always in tune with your mind. Virtually all people who struggle with weight loss are up against a heavy resistance that few of us have ever even heard about before.